"Chicken walker" - the term - is totally a thing. Not only is there a TV Tropes page about them, there's a Wikipedia page too. So no ragging on your players if that's what they choose to call them, despite your insistence on calling them "bipedal battle mechs" or whatever.

Transcript

{Ewocs fighting troopers}[SFX]: Pow! {a chicken walker fires}[SFX]: Pow![SFX]: Kaboom![SFX]: Pow!C-3PO: Chickens? Where are the camel meeples?[SFX]: Pow!GM: These can fit between the trees better.[SFX]: Wrestle![SFX]: Kaboom![SFX]: Thud!Clone Trooper: Aaargh![SFX]: Thud![SFX]: Kaboom![SFX]: Pow![SFX]: Pow!C-3PO: Are you having fun with all those miniatures?GM: Yes. Yes, I am.